Re: Ratios

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "torlin" <torlin-at-ghostmail-dot-net> 

I was always told (and probably assumed) that a cone-shaped primary couples 
more efficiently than a flat-wound primary.  Is this true, or was I being 
led wrong?

Thanks for your reply.

Chris

On Tue, 28 Oct 2003 12:52:33 -0700
  "Tesla list" <tesla-at-pupman-dot-com> wrote:
>Original poster: Esondrmn-at-aol-dot-com In a message dated 10/28/03 7:51:16 AM 
>Pacific Standard Time, tesla-at-pupman-dot-com writes:
>
>(SNIP MY ORIGINAL QUESTION)
>
>
>Chris,
>
>Any specific reason that you want to go with a cone shaped primary?  I 
>would definitely advise you to build a flat primary.  Go with 14 to 15 
>turns - but first do the math and insure that the design will tune with 
>about 12 or 13 turns which will leave some room for experimenting.
>
>For secondaries, I prefer to go with 4.5 : 1 or even 5.0 : 1 ratios.  I 
>like to have the toroid as far from the primary as possible and the longer 
>winding length allows larger wire size.  Determine your winding length 
>then select the correct wire size to produce 1,200 to 1,400 turns on the 
>secondary.
>
>Ed Sonderman
>
>Ed Sonderman